Aliens land in South Africa and have no way home. Years later after living in a slum and wearing out their welcome the "Non-Humans" are being moved to a new tent city overseen by Multi-National United (MNU).

Armed men hijack a New York City subway train, holding the passengers hostage in return for a ransom, and turning an ordinary day's work for dispatcher Walter Garber into a face-off with the mastermind behind the crime.